The chicks start shaking the egg and chirping then it stops. When this happened I thought that it was just them getting tired and taking a break. But after three days none of the eggs hatched it was day 25 so I decided to crack open an egg and see what was up. When I cracked it open there was a thick skin thingy over the chick, to make sure that it wasnt just the one so I cracked two more but both of them had the same exact thing. I am thinking that the skin is to thick for them to get through so they are dying. What could have caused this to happen.